Working Principle of Rotary Unloading Valves
Rotary unloading valves play a crucial role in dust removal equipment for discharging ash, delivering air, and feeding other devices. Star-shaped unloaders are especially suitable for handling powdered and granular materials. Here are the key points of their working principle:
1.Pneumatic Output System: Rotary unloading valves are widely used in pneumatic output systems. Whether in pressure or vacuum output, star discharge valves provide a stable and continuous feed to the conveying pipe. This ensures stable gas and solid phases within the pipeline, promoting normal operation of the pneumatic transport system. Additionally, they effectively isolate the pressure between the upper and lower sections, serving a locking function. Therefore, star discharge valves are essential components in pneumatic transport systems.
2.Quantitative Discharge: As materials in the upper storage bin fall due to gravity and fill the gaps between the blades, the rotation of the blades discharges the materials below. This allows star-shaped unloaders to achieve quantitative and continuous discharging.
3.Wide Applications: Rotary unloading valves can serve as dischargers for storage bins, particularly in material collection systems. As advanced unloading devices, star-shaped unloaders play a vital role in dust removal systems. They find applications in industries such as environmental protection, metallurgy, chemicals, food, cement, road construction, and drying equipment.
4.High-Temperature Resistance: Standard rotary unloading valves can handle materials up to 280°C. Their bearings and impellers are isolated, preventing contact between powders and bearings. High-temperature unloaders can manage materials up to 500°C and utilize chain connections.
Structure of Rotary Unloading Valves
Rotary unloading valves typically consist of several parts:
1.Valve Body: The valve body is the main component, usually made from cast iron or stainless steel. The shape and layout of the internal passages determine the valve's applications and performance.
2.Rotor: The rotor is a key component, including the valve core, valve shaft, and valve. The core rotates within the body, altering the flow direction and opening or closing the pipeline.
3.Sealing Elements: Seals function between the rotor and valve body to prevent fluid leakage. Common materials for seals include rubber, PTFE, and metal.
4.Drive Mechanism: This mechanism operates the rotor and may include handwheels, electric motors, or pneumatic drives.
5.Accessories: Accessories like safety valves, exhaust valves, and locking devices enhance the safety and convenience of rotary valves.
Maintenance Methods for Rotary Unloading Valves
In a factory setting, equipment may encounter problems during operation. As a widely used product, unloading devices can experience various issues. Here are some maintenance and repair tips:
1.Regularly Check Lubrication: Unloading devices come filled with lubricants and grease from the factory. During operation, regularly inspect the lubrication oil, especially in high-temperature or dusty environments. Reduce the oil change interval to prevent damage.
2.Address Air and Dust Leakage: If air or dust leaks occur along the axis during operation, tighten the screws on the pressure cover. Alternatively, replace the packing and re-secure the cover.
3.Follow Disassembly Procedures: The internal structures of various models are similar, and the disassembly and assembly processes are generally the same. During transport, keep the device stable to avoid impacts that could damage the casing or motor.
4.Self-Diagnose Faults: When issues arise due to inadequate maintenance, users should learn to self-diagnose faults to enhance efficiency.
- Incorrect usage and imprecise operation can damage the motor. Always follow proper usage guidelines.
- Periodically check the cleaning control system to ensure correct cleaning cycles. Inspect the pressure switch and clear any blockages in the pressure measuring points.
- Regularly measure process parameters such as gas volume, temperature, and concentration. Investigate and address any anomalies promptly.
- When the unloading valve stops, continue operating the unloading valve and exhaust fan for a while to eliminate moisture and dust from the equipment. Manual cleaning may be necessary to prevent moisture from affecting the filter bags.
By following these maintenance practices, users can extend the lifespan of rotary unloading valves and ensure their reliable performance in various industrial applications.
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